Cylinder-bore polishing and finishing attachment



R. L. MEAUX Dec. 3, 1929.

CYLINDER BORE POLISHING AND FINISHING ATTACHMENT 2 Sheets-Sheet l Filed Nov. 12, 192

I OR 1?. L/Yeam.

Main.

ATTORNEY Dec. 3, 1929. MEAUX 1,738,443

CYLINDER BORE POLISHING AND FINISHING ATTACHMENT Filed Nov. 12. 1927 2 Sheets-Sheet 2 l 1 I III "nu" INVENTOR RL/Yswzmt BY 2 91/ ATTORNEY Patented Dec. 3, 1929 nonnn'r L.

PATENT] OFFICE MEAUX, OF EUNICE, LOUISIANA CYLINDER-BORE POLISHING AND FINISHING ATTACHMENT Application filed November 12, 1927. Serial No. 232,865.

The present invention is concerned with the rovision of a machine tool attachment for nishing and polishing any cylinder bore after the latter'has been bored with the rack boring tool. The attachment is intended. for use on a lathe boring machine, or a portable boring bar.

An object of the invention is to provide a device .of this character which will permit cylinder bores to be finished and polished with absolute accuracy, and without the production of any chatter marks and scores, such as are present in cylinders finished by a scraping tool. By producing an absolutely smooth l5 finish on the cylinder bore, many inconveniences and disadvantages are eliminated in so far as future operation of an engine is concerned. It is well recognized that cylinder bores which. are scored or scraped quickly produce loose acking rings and consequently loss of fuel and efliciency.

Another object of the invention is to provide a tool which is readily capable'of ads justment for operation on cylinder bores of different sizes.

Further objects are to provide a machine tool attachment of the character stated which will be simple and-practical in construction, rugged, durable and efficient in use, and well suited to the requirements of economical manufacture.

With the above noted and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more :Eully hereinafter set forth and pointed out in the claims. The invention may be more fully understood from the following descripw tion in connection with the accompanying drawings, wherein- Fig. 1 is a view mainly in' end elevation of my improved polishing and finishing tool, parts of the tool being broken away and in section to disclose the adjusting means, this receivinggroov'es 22.-

view being taken approximately on the line 1-1 of Fig. 2.

Fig. 2 is a view partly in side elevation and partly in longitudinal section through the tool.

Fig. 3 is a side elevational view of the tool illustrating a slight modification.

Fig. 4 is a view mainly in end elevation illustrating a further modified type of tool.

Fig. 5 is a view partly in side elevation and partly in section of the tool of Fig. 4.

Fig. 6 is an enlarged view partly in section and partly in side elevation of the tool of Fi 4.

Re erring first to Figs. 1 and 2 of the drawings, numeral-10 designates a borin bar, and numeral- 11 designates .a body in t 'e nature of a casting keyed as at 12 to the bar, and selectively locked against movement relatively .to the ar by a set screw 13. It will be obvious that the body 11 may be either fixed to the bar or slidable therealong as desired.

The body includes a plurality-preferabl four--radial extensions 14 presenting inc ined faces 15 which converge toward the forward end of the tool. The extensions 14.- are preferably connected to each other by in'- tegral web portions 16 and 17 at their larger and smaller ends respectivel The inclined faces 15 of t e extensions 14 are machined'to rovide tracks and formed with longitudina extending T-grooves 18 therein receiving "z-bolts 19 carried by carriage blocks 30 which move on the tracks. The carriage blocks 20 may be secured against sliding movement alongi the tracks by tightening nuts 21 associate with the T-bolts.

Each of the carriage blocks is provided with a recess 22 in its outer face receiving a hone 23. The bones are backed by plates 24, the latter being spring pressed outwardly by coiled expansion s rings 25 arranged in pockets 26 in the carriages 20; these pockets communicating with the bottoms of the hone- Retainer stri s such as strips 27 aresecured to the en faces of the carriage blocks 20 and engage the projecting ends of the lates 24 to limit outward movement of the atter.

Projecting laterally from one side of each carriage block are pairs of web-like extensions 30, these extensions being spaced apart for the reception of movable carriage operating plates 33. The plate 33 at each end is forme with pins 32 received in open slots a 31 formed in the webs 30.

The plate 33 is mounted upon an'operating screw 35 rotatably journalled at eachend in the web 16 and 17 and having a projecting squared end'36. for the reception of an operatin key.

As 1; e screw 35 is turned, late 33 is fed alon the screw, carrying wit it two of the carnage blocks 20. The connection afforded by the pins 32 and slots 31 is such, that relative separation ofthe two operated carriage blocks as they move toward the high ends of their slides, is automatically accommodated directly keyed into the tracks, are spaced further from the central shaft 10 by skeleton webs 20, these webs being keyed to the tracks.

The form of the invention shown in Figs. 4 and 5 involves the use of a generally similar construction, except that the inclined tracks are eliminated, and the hone carriage blocks adjusted in and out by the use of shims 40.

In Fig. 6, raising blocks 41 are substituted for the shims.

All forms of the invention provide some means for effecting radial adjustment of the hones relatively to the central tool carrier shaft 10. All forms of the invention contemplate the use of a key and set screw, such as shown in Fig. 1, for retaining the tool against longitudinal movement relatively to its shaft 10, or the use of a key and a groove 12 such as shown in Fig. 6, which permits sliding of the tool along the shaft 10. In all forms of the invention, thetool is keyed to turn with the shaft. It is believed that the'operation of the device when the tool is attached to a lathe boring machine or a portable boring bar, will be obvious from the foregoing description. The use of the spring pressed hones instead of cutters prevents tool marks or chatter marksin the finished cylinders,

and leaves the cylinder absolutely devoid of roughness at any point.

Obviously, various changes and alterations might be made in the general form and arrangement of the parts described without departing from the invention. Hence I do not wish to limit myself to the details set forth, but shall consider myself at liberty to make such changes and a terations as fairly fall within the spirit and scope of the appended claims.

I claim 1. A machine tool attachment for finishmg cylinder bores, including a body keyed to an operating shaft, a plurality of carria e blocks mounted on the body ,and radially a ustable relatively to the longitudinal axis of the shaft, hones mounted on the carriage blocks, and springs urging the hones outwardly into engagement with a surface to be finished, said body including radial extensions having inclined outer faces along which the carriage blocks are slidable, the blocks being keyed to the extensions for sliding movement along the inclined faces thereof.

2. A machine tool attachment for finishing cylinder bores, including abody keyed to an operating shaft, a plurality of carria e blocks mounted on the body and radially a j ustable ,relatively to the longitudinal axis of the shaft, hones mounted on the carriage blocks, and springs urging the hones outwardly into engagement with a surface to be finished, said body including radial extensions having inclined outer faces alon which the carriage blocks are slidable, the %locks being keyed to the extensions for sliding movement along the inclined faces thereof, and manipulating screws for sliding the blocks.

3. A machine tool attachment for finishing cylinder bores, including a body keyed to an operating shaft, a plurality of carria e blocks mounted on the body and radially a justable relatively to the longitudinal axis of the shaft, hones mounted on the carriage blocks and springs urging the hones outwardly into engagement with a surface to be finished, the body including inclined outer faces along which the carriage blocks are slidable, screws rotatably mounted in the body, operating plates working on the screws, the carriage blocks including forked extensions, the arms of which receive the operating plates.

4. A machine tool attachment for finishing cylinder bores, including a body keyed to an operating shaft, a plurality of carria e blocks mounted on the body and radially a justable relatively to the longitudinal axis of the shaft, hones mounted on the carriage blocks, and springs urging the hones outwardly into engagement with a surface to be finished, the body including inclined outer faces along which the carriage blocks are slidable, screws rotatably mounted in the body, operating plates working on the screws, the carriage blocks including forked extensions, the arms of which receive the operating plates, said carriage blocks being slotted and said plates havini pins thereon received in the slots, where y to permit relative separation of adjacent carriage blocks as the latter are moved along their inclined guideways.

Signed at Eunice, in the parish of St. Landry, and State of Louisiana this 7th day of November, A. D. 1927 ROBERT L. MEAUX. 

